Residual Stress Analysis by Simplified Inherent Strain at Welded Pipe Junctures in a Pressure Vessel

Author:

Mochizuki M.1,Hayashi M.2,Hattori T.2

Affiliation:

1. Department of Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita, Osaka 565-0871, Japan

2. Hitachi, Ltd., Tsuchiura, Ibaraki 300-0013, Japan

Abstract

We present a new and simplified method of estimating residual stress in welded structures by using inherent strain. The method makes use of elastic analysis by means of the finite element method and is used to calculate the residual stress in complicated three-dimensional structures efficiently. The inherent strain distribution in a welded joint of a small-diameter pipe penetrating a pressure vessel was assumed to be a simple distribution, and the residual stress was calculated. Inherent strain distributions were inferred from those of welded joints with simple shapes. The estimated residual stress using these inferred inherent strains agrees well with the measurements of a mock-up specimen. The proposed method is a simple way to estimate welding residual stress in three-dimensional structures of complicated shapes.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Safety, Risk, Reliability and Quality

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1. Safety Detection and Evaluation Method of Pressure Vessel Use Based on Multiple Regression Algorithm;2022 IEEE Conference on Telecommunications, Optics and Computer Science (TOCS);2022-12-11

2. Influence of welding residual stresses on the ductile crack growth resistance of circumferentially cracked pipe;Frontiers of Structural and Civil Engineering;2012-08-18

3. A perspective on residual stresses in welding;Science and Technology of Welding and Joining;2011-04

4. Prediction of Ductile-to-Brittle Transition Under Different Strain Rates in Undermatched Welded Joints;Journal of Pressure Vessel Technology;2011-03-29

5. Effect of residual stress on cleavage fracture toughness by using cohesive zone model;Fatigue & Fracture of Engineering Materials & Structures;2011-03-25

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